19719631415409 has 4 divisors (see below), whose sum is σ = 26292841887216. Its totient is φ = 13146420943604.

The previous prime is 19719631415371. The next prime is 19719631415437. The reversal of 19719631415409 is 90451413691791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19719631415409 - 2¹² = 19719631411313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19719631415009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3286605235899 + ... + 3286605235904.

It is an arithmetic number, because the mean of its divisors is an integer number (6573210471804).

Almost surely, 2^{19719631415409} is an apocalyptic number.

It is an amenable number.

19719631415409 is a deficient number, since it is larger than the sum of its proper divisors (6573210471807).

19719631415409 is an equidigital number, since it uses as much as digits as its factorization.

19719631415409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6573210471806.

The product of its (nonzero) digits is 7348320, while the sum is 60.

The spelling of 19719631415409 in words is "nineteen trillion, seven hundred nineteen billion, six hundred thirty-one million, four hundred fifteen thousand, four hundred nine".